Windows Phone 8.1 Update 2 v 8.10.15127 finally arrived as the default OS version on new Microsoft Lumia 640 and 640 XL, and again, there is a new hidden API in it, so let's take a look, if there is anything interesting that we, developers, can use in our apps.

tl;dr The API diff between WP8.1 Update 1 and WP8.1 Update 2 is here on GitHub. Only added/updated Windows.Phone.Notification.Management API - nothing we can use in our apps without special Accessory extension SDK, + new property in PhoneApplicationPage,